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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e83a74418afe3d686907cf4c159ea42ce35fa513f16f48ff9f02f654fdf5cbb3' 
  AND token = 'BP4b4d1Ts2DZwiRAgHKascn5IiUnUpBbYo3o6kUHkns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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