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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaa027e3747b5a64bdedb851cc8c9ff8ce2b7dac2f3cff82354cdfe792343f36' 
  AND token = 'KjY/KB8FACmnEVmhIOBvb3e/75EtYfsdr9oIpHWctKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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