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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a4847798d4d6e8aac429ae89e5982ed0f180391622c432029cbd828af08ff98' 
  AND token = '16X+9BZKaE/2Y0WWA1t59eL1G2oyxWSaHU8G2yaPa8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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