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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aab28ed040d0d3d1745fc20a5c6705f9cec68edb491af713dee2b51131c02d3a' 
  AND token = '6Y10ztGBkltyugnGflRH3XObRybKR76oMDoRFFajGV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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