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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '113ae2632f6ede75858adac792131dacd9219aea5f3e5530e1ce1aef3a1354d4' 
  AND token = 'BYAEgH90ZbbL/s+rHEoRpGm5t7pDuJf39PD4NAmN7fA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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