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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '920890660adb522277506950b2f580b4cac680bae580e5cc4dcb00142ccd1eb2' 
  AND token = 'hTt3P6JH2IB0t2W3LOqnjuoggIN4jOV27eJTWLJVwIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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