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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96d46dc6a49cb518b25bbec76cb3a691c4256391fc8cddb6717de627094754b7' 
  AND token = 'r6anIUtfxvECOCFfOZIBiBnus2c13/v+8GqgxT/jEaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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