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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9299cc284badeebd33cae1d5c67da538846e8985037afb0c4d3ab57d4683a320' 
  AND token = 'q2qy8Eb61WJlLgk8iljaWpocJmS7BG1DXPYzGPFPync=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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