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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bb3d5d0aa2518adcd08e33dfe6e84a3fb86c599727c9b51b0b666ac6ceadbfc' 
  AND token = 'zooza/wk3tP167nFgTQiUy61aV3yT3QKuBaQtlvYjQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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