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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20de9b68082d26c3c72bcb3dfd692ae2fdcca736c8a643f41f5ddfbda9af0ca9' 
  AND token = 'BwO6rqp3oojvix6DjTbiEGyGKmGR/pTomf5hsK5jRs0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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