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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '918680414749df4becbee0a3d9862d91d0006e670538ba9eb758f9fdfb63aeea' 
  AND token = 'awr6FfBRX1Ah+hgaCdYx2wZGl9A5+F52PllOdVxVDUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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