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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a632a502ab444bab621ad26ac8c2c6d1563cd1a578fe3238d852fee2df106857' 
  AND token = '2nB8TrgbCrknyANijV5DZDe6r/lWI2VR8EJvhyxhxeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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