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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca838d6a70acea9fd2ddf64aaaafa4a74392fee4c1849dc581a7cdd220a55fca' 
  AND token = '4ArFzQsLyinizLKkdFfTgcmh2S5YnFgv5coT+56EIGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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