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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '567b5f29b729f5e669ac909b2668a041e6d62b449cb657c1232f08eb3d4e3f47' 
  AND token = 'Eb9dBVYljEoLsFWuG8xfoWu/iDCkDhb1pi9x7DvFmsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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