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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b9cc64c8bf2144b835afa06de6729ef5ea72d31b0a82047f60dce46f2a6288e' 
  AND token = 'u8fmvgm58DZMX8gCguVo8IWtzIzg5a3qvHiSP2wv0tE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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