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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c26b9fd8276054186c6295543755d6db910731372c2004ff1466750921d42e9' 
  AND token = '+hYtWrSFW99/S03A99q1Xrgu2QGNSEENZGAGkNkMiG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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