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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f46395ebc3654e51a4f9e4ef8edcb24959bd67ecf4cf5587db66a45bfd15d99' 
  AND token = 'Thr2kCKd7+uNYUG3n3NtUxBwU4zqa1WywnoJLUNNUUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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