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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4af6f5f332e1f4a6aae1b1c6b7d854e4c08e87f03ed0bad2a7282c41122eaa2' 
  AND token = 'gj1J0lQ/Q3S6pAKXDlfWxZEzCc/Leukrt8sZVIZiGrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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