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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6b2e3e125994a0d6588acb8c025f8c8a8a4487674e459f10a951abd8ae8d198' 
  AND token = 'BJpFIjjJTsTcsyzWuc1C5vLJIo7rs/hFkFn6uu6PlvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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