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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc5ef347b6994794251e90b26f27803f1daf15534a5924e4710d1ce6ca0993b7' 
  AND token = '2MPo8laQ6Ipg/vm5CioSxh60TPdsg39mE4uLUjgESSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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