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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e903c9b4ac6a1bdbd4e83c3f7b18e2da05709bf86fe435a1cc6cc2d4367dfbb' 
  AND token = 'NrdlIBViPL8Qm4buA08yHRpoHpIT/4oeoC7eh9qYSt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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