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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c22ece7a1581d1292404513f31a4cbec4fbf9392733e1996b71a98152dc6ca4a' 
  AND token = '9m3djXtsBXS67HhbVLa1rPdAhJUs71oSgY+xunfi1D8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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