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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fce3086ea4863369bca6c85c639bc75fe39d74bc1bbbeb9ae3d85e89a9744d9' 
  AND token = 'izxPfauvhuqJo9DyD4XsJzwkadOlzKO0e+u89KzWi5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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