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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5102712d918e43ffbb0a0f1928baf2a809359ceeec648dc7a548f7e98ab1ca07' 
  AND token = 'wDtvb/w0HpqbH2HIWU8IwXnuaJFee35/+11rcEWLHQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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