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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '883cfbd2373a2bfdd23321be0326151615bdfc8f2a8f0069d52dff2c0b63717f' 
  AND token = 'nTUL5noND7hybp4lUrJdCv7f7ozqJdDtUFJOJ5/hn3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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