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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8b9f65399a755fc67ac5f45f7084e8380f51713a1fe8c796605576d9ac38f45' 
  AND token = 'ThLBmV4jEmhTZYwCqwAViEaC64C1BX9/k/Ge6mSNoiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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