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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9bbbc64473279b0002e77259d351ed383fa635dc241596842f517f136b48a85' 
  AND token = '4ySLIMFv0m7n2gpATecd39cU7BS+kI0aKW3ViLqc+30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}