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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63ed35c15659ddfb634271d568da8934cf1af2a90c7fa31125a3c1f5c7322e8b' 
  AND token = 'ACgalBQfKaolt/5KSv8cZtfkozjSpOpBS3KuDjN0ofo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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