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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50b180a36902d688670316c9edeaf34249ea9fb60e5f46b7c3e3c5a026abb88d' 
  AND token = '5IjF6f47ikvtPaW9pu7MHEUNvxb57C25lO5/hjbt9vA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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