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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9bdac6b39766782b6b4edaef3fbcaf2ff06807f3c4f02cc9a1627c6d6239d6a' 
  AND token = 'OV89xjxs2Hhg9PI7V4jAvZFYndaij3+mqQK9C9RDyc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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