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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f682ca4d30de104d69c82fa73ed019b09d8481f1e97efdf12da53f2dbb6aa59' 
  AND token = 'ZFEk/EpAmhtstqD6NmpgcmgY7v21OPjzgc9zm8kmm5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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