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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '078711e3b993f02c5f1e7bdc5df6586359cdd96c01a75e2c198c08bb1c0fd7f5' 
  AND token = 'wkLA8eooyOuqgbTJi/mBudNizpJYrRKkusXtFqE4R84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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