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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5967a76af6314b783d3fea735706aff5c2e8a96da2ba8700cb1d0f59641ed747' 
  AND token = 'WvcIr/Fe7xqU37q6tNyvSpyf8wQwemjSVqdqPeUOZMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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