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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfe21d0bdb3f3ed95994c4d91f819867f198d95cf48915e423e17699664d05f0' 
  AND token = '0FvXDlE67/yYDscNeLO52mrhD9/L4SO9h7P0Cb/V6v8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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