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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24ba4193cc7a930b63b5577adb70357fc7530ad4fd6b5e92415208977866d94e' 
  AND token = 'D+7Z7vGWxdRZOD2snHsJeS+D7bT7gpV46Ft2rEco9bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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