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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52f74a84821c22cec8caacdc33c9803f819a117e466d9538b6f63e803729f3b4' 
  AND token = 'C3gP59W8+1j1zjRMBt/cqYbGbevmktrPbYu8AQLMTrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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