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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bda196bc1c6b4c534e7e6390cb67dcd5f3fe0be335733454783687c0fda21f72' 
  AND token = 'WN1qzU4d3TRh3aP4Y8YPn+vuIfnSzW/K32164vt/pJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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