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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0efa447fea49062556125deb4eb7c72435eccdd8f5af45471787933aba65532' 
  AND token = '2aRKdyGmBK0/f/IqGJdSPv7TksHy5NCkXIC+qvi1QIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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