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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '261de5e1d94ae979ca71eb53d721a59a7e8544ea1fc80926c674fd1c6217627d' 
  AND token = 'bWF5ysTOUt/K80NH+mX8/XJTSSwC3NNVb70crg1WWGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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