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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fce2446f171db8ac68bfa054f2bce197572229765a9c76183439cebb4030bb93' 
  AND token = 'VX1X2fGf3Vw37v47mtVgE087wgokYp6Lq3nEVrUPves=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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