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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48b5a504b0809c23e75747fc943245c9daa21dd74628bb30349dacad8535fafb' 
  AND token = 'U+Yq1nQB5P9kco6oAT9zmEWtAY1tNajJqy3FJHl3y+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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