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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8edb27fe00879fa4ef8281ca406914e5cad05cd29e4938ac091441299103bf7' 
  AND token = '6zh85kKBXB0T/xQhFMAnjuDXyFKRFhyWhhV/e++i8yY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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