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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13c8da72c07432f19663cde0ca9fc2bd4e3a73d179fffbce1616c3ce69115997' 
  AND token = 'ueM+89dtgXGNnTMdt/3GKEfN+BXZ5vIBg5K4bw47ekQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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