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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e467c464ef8526c38d87cc4261179e1d782495d9fb41ccc5bd6e440dcf45b557' 
  AND token = 'dqoAdjyRUaDw0YxDUpfusolxGHFl/PhKBb1hMDN4O2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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