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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5cb6a8228efd1ffb43f28336a857bca1212baf12f9c0ac75aa0521893ea25b4' 
  AND token = 'iQrREOaYRIFmRhGptLRZdVQwOYsFOAVrZKsmx0T7acc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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