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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e60e89d3ce4eef588ae816a2d47fec67dc5376536ffa794dc8157b7f43e4dea' 
  AND token = 'uWLkvybkq7Xt8K2fuI5D0j+kAY4U4n1mZ2VC15vrUmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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