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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b2df1e6cc5babd5715c54441ece575724f22e63b304f04c8f08fb7e86d81461' 
  AND token = 'GGRyoq25wZ76O+mAq2Ehyy+AFkKyB+jTITqfneBvjss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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