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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93473bb283d9360e93969cadd7eea4ad017f147369da2a0d957e284bbad3b72c' 
  AND token = 'FBGWEtay/5Dzt9XuTpzrymgUjgljSx7tnLeKpfLK+HA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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