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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83cd9f139989287cbad70e72408f1af54659f69791be9a2ca7bdfbcc20a99512' 
  AND token = 'HX/l7cTj2heZlAdN/RkNPZgWbK4K9VJAHS4vm2j4K1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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