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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd8e11bba2d8a71c5889597742f167a747ee6970036135f503ef5f03d5e21e7e' 
  AND token = 'bx07EgEe+JYqbUn1Eb+HZuZmbWYsDjN/ZPClpYhapoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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