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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fed56b5a4de37f2353ce285e954d5f6edcf94c5fa13fd25fcf2a17aeda547d9d' 
  AND token = 'lqscTte69iAPDibxqbR/m74czRU5r4TFiRXhHU5dYRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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