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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a040c16b853e7b35df0ef765a7ea90dba9321de88ed694058ab49bd0a137038' 
  AND token = 'oPiprIIVy5WUUIJwp3vbDzlXGyjS1Ykb7iYY1VeY8hQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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