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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7abf4edcb8f022c61e61c8f6f4affd9955cfd42c8d37a5dcc756259f370843d' 
  AND token = 'wgnSjDzYDqjiZNgYpyWqk5q9lxO1wWr7NSBctUdfrAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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