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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc96e2f6e81dc8ce2e2c2388a645f1d6d80f2208e90f034704f23d1b0e849504' 
  AND token = '3FDO/NrBBOeEnFoZnXaudevIrmqg/3KAb4ZQaUNLP+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00191

JSON explain

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