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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '848f87fb9d2fb56704affee94c226b4c823da9692f6f417a4f159fed4bc80983' 
  AND token = 'pfbxDgRhqgkHJ5sov8NX6d3miWD3W5uQvo4OUA2dJw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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