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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d0c7819f3c80a3d00c2115a81fe50ab3ce53bb6de38068e31859aeda3055476' 
  AND token = 'gWGr/qjMoZLK6gjiqcVHC6Tv74N+VhL28Azqx7WrrRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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